Recent content by dwilkerson

Thanks, David

I have been calibrating a sub-micron particle sizer with 1 um (1000 nm) standard. After testing the standard, the test results on my print-out: (X25 = 812.7 nm, X50 = 977.7 nm, X90 = 1389.0 nm) According to USP, the limits are +/- 6% of the reference standard values for X25, X50, and X90...

We have 2 media bottles: 10L and 5L , autoclavable glass with screw-on high-temp caps. We are trying to autoclave about 12kg of Carbomer solution. 2 Questions: Some people say to leave 25% head space for boiling over, some people say 50% head space. Since we need about 12L solution...

Bringing this up from it's slumber. We had Mathematica and Matlab at our state university for free but on at the labs as well. No personal copies.. BKCHEM is exactly what I was looking for in my own research. Thanks, David

"Quantum measurement by a self-replicating biomolecule was the key event that caused life to emerge." "Using the Many Worlds approach, peptide addition within the first (proto-) cell would have taken place, not in a classical universe, but within the multiverse of all possible states."...

"Jews and other religious groups have been circumcising men for hundreds of generations with no noticeable withering of the foreskin among their descendants. However, Lamarck did not count injury or mutilation as a true acquired characteristic, only those which were initiated by the animal's own...

Phylologist's Dream Site The Tree of Life Web Project (ToL) is a collaborative effort of biologists from around the world. On more than 4000 World Wide Web pages, the project provides information about the diversity of organisms on Earth, their evolutionary history (phylogeny), and...

Check out Brownian Motion and The Casimir effect, see if this helps pull together some ideas about matter and motion.

In my opinion, QM serves as a base to one of the most beautiful mathematical theories every constructed, i.e. string theory.

Good question. There are 2 excellent experiments in the near future that will "make or break" string theory in the next couple years. One of course, is with the Large Hadron Collider 2 years away and the other is with the Laser Interferometer Space Antenna scheduled to launch in 2013. The first...

Because the Standard Model doesn't include gravity and has dynamic parameters, a theory of quantum gravity is definitely needed. I believe it would bring us one step (actually many steps!) closer to a more "complete" unified theory of everything. We need a theory of quantum gravity to study the...

I pose another question: Will we ever know why all of the "universal" constants are constant? Haha, just kidding around!

Raymond Chang's Chemistry is probably the best I have found. I think it's the most used college general chemistry book on the market, at least that's what my prof said!

"Quantum measurement by a self-replicating biomolecule was the key event that caused life to emerge." Try to follow me on this: "Using the Many Worlds approach, peptide addition within the first (proto-) cell would have taken place, not in a classical universe, but within the multiverse...